Neurotransmitters
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Acetylcholine (ACh)
Excitatory or inhibitory; involved in arousal, attention, memory, and controls muscle contractions
Dopamine (DA)
Excitatory or inhibitory; involved in control of movement and sensations of pleasure
Serotonin (5-HT)
Excitatory or inhibitory; involved in sleep, mood, anxiety, and appetite
Endorphins
Inhibitory neural regulators; involved in pain relief
Norepinephrine (NE)
Mainly excitatory; involved in arousal and mood
Glutamate
Major excitatory neurotransmitter; involved in learning, memory formation, nervous system development, and synaptic plasticity
Gamma-aminobutyric acid (GABA)
Major inhibitory neurotransmitter; involved in sleep and inhibits movement